Clamp



FIG. 1 is a reduced perspective view of a clamp showing my new design, the broken lines shown are for illustrative purposes only;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof representative of the appearance of either side of the clamp;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a clamp, substantially as shown and described. 